Gosha and Zosya, ten-graders, love each other. Their marriage is ahead right after they finish school. But Dina also loves Gosha and her influential parents are ready to ensure a successful life both for their daughter and the future son-in-law. During the final exams, Gosha finds out Zosia is pregnant, and he goes to dinner with Dina on the same day. The school waltz he dances already with Dina.
